Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c123c83e7fdf8c1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 08:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66c2b339d7c1d05482ed9b65b243df15 SHA-1: 8988422ea5cc7c73b30645687fb93bcbbd5ece38 SHA-256: 6c123c83e7fdf8c149661da2f62d7dc0e0950537f0d4dbae41d6a75014017e48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, and is described as a link farm. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://195exim.com/datas/files/38145172097.pdf In PDF document text
    • http://bielwod.com/userfiles/file/63685834808.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161322cf57adf4---rixozusesokajarapalira.pdfIn PDF document text
    • https://architektor.ru/uploads/file/49452637235.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631178199.pdfIn PDF document text
    • http://beta-rc.com/upload/files/mopigamawotozogaxamibire.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/xojoniradi.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/1968916919.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/jetukano.pdfIn PDF document text
    • http://tvsporedi.si/vsebina/ledafoz.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/pojeloxadazi.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/guropudamato.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/29283238746.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/96460680215.pdfIn PDF document text
    • http://abriganature.centralcms.cloud/galeria/files/mozikofupusutome.pdfIn PDF document text
    • http://llux.vn/uploads/files/lebiwumaniza.pdfIn PDF document text
    • https://bachson.net/upload/file/tisaki.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/ribamuderapipetiwaginat.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/bewer.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/pekomijep.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/52492088296.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210902050343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=apps+moved+to+sd+card+move+backPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 10712 bytes
SHA-256: d7eb13c814b92770b6fb6346c463a17731599bd6372e90df7705a9c986f1a51e
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 18216 bytes
SHA-256: 8905ff83b1ade0a97d5fbc9c4b91c214f8d2377f853ed16f5121934e8553f8b7

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